The Beetronics Swarm Asas de Fogo is an analog fuzz harmonizer: a pedal that takes your guitar signal, turns it into a square wave, and then multiplies and divides that wave's frequency to produce harmonies. Beetronics describes it as "an Analog Fuzz Harmonizer that sounds like a thousand killer bees coming to get you!" Because the harmonies are generated from a square wave rather than by digital pitch tracking, the sound is fuzzy and buzzy by nature, sitting somewhere between a fuzz and an octave and pitch pedal.1
The maker says the circuit gives nine possible harmonies spread over two octaves, so you can stack intervals above and below your played note from one stompbox.1
How it works
Beetronics explains the core of the circuit this way:
"It basically turns your input signal into a square wave, than multiplies and divides the frequency of that wave, giving you nine possible harmonies in two different octaves."
A square wave is rich in odd harmonics, which is what gives octave fuzzes their buzzy, synth-like character. The Swarm leans into that: the harmonized notes are built from the squared-up signal, so the effect is inherently aggressive rather than a clean pitch shift.
The page also names one control, the WORKER, which "sets the level of your input signal, now fuzzy and buzzy."1
Versions and related pedals
The Swarm circuit has appeared in many editions, from the standard Beetronics Swarm to limited runs like the Swarm Fuzz Harmonizer The Blackbee Edition and the Swarm "Great Pumpkin". The Asas de Fogo is a Custom Series version, Beetronics' line of hand-finished one-offs. Players comparing circuits may also want to look at the OctaHive, Beetronics' high octave buzz, and the WhoctaHell, its low octave fuzz1.
Specifications
| Specification | Value |
|---|---|
| Pedal size | 5.5" x 4" x 2.75" (including knobs, switches and etc)1 |
| Enclosure size | 5.5" x 3.25" x 2"1 |
| Weight | 1lbs / 0.5 kilos1 |
| Power | 9VDC (Center Negative)1 |
| Current draw | 7mA1 |
| Bypass | True Bypass1 |
Beetronics' own page lists more than one set of dimensions and weights for the Swarm, and two different lengths for its Hive Happiness Guarantee (30-Day, shipping not included, and 14-Day). The figures above are the ones given in the pedal's specification block; the page itself disagrees with itself on the rest, so treat the alternates with caution.
The Swarm Asas de Fogo was listed as sold out on Beetronics' site as of 2026-10-25. As a Custom Series build, restocks are not guaranteed; the standard Swarm Analog Fuzz Harmonizer is the closest regularly produced version.
Videos
Guitar Bonedo
Questions
Is the Beetronics Swarm Asas de Fogo true bypass?
Yes. Beetronics lists the Swarm Asas de Fogo as True Bypass, so when the pedal is off your guitar signal passes through without the fuzz harmonizer circuit loading it. That matters on a crowded board, where buffers and non-true-bypass pedals can add up and dull your clean tone.
What power supply does the Swarm Asas de Fogo need?
Beetronics specifies a 9VDC power supply with a center negative plug, the standard for most pedalboard supplies. Current draw is low at 7mA, so it sits comfortably on a shared output of a typical daisy-chain or isolated supply. The maker's page does not mention battery operation.
Is the Swarm Asas de Fogo analog or digital?
It is analog. Beetronics describes the Swarm as an Analog Fuzz Harmonizer. The harmonies come from converting your input into a square wave and then multiplying and dividing that wave's frequency, rather than from digital pitch tracking.
Where is the Swarm Asas de Fogo made?
Beetronics states that the Swarm Asas de Fogo is hand made in California. It is part of the company's Custom Series, which pairs the standard Swarm circuit with one-off artwork and finishes.
Sources (1)
- Swarm Asas de Fogo, Beetronics
